1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2015 Texas Instruments
4  * Author: Jyri Sarha <jsarha@ti.com>
5  */
6 
7 #include <drm/drm_atomic.h>
8 #include <drm/drm_atomic_helper.h>
9 #include <drm/drm_fourcc.h>
10 #include <drm/drm_framebuffer.h>
11 
12 #include "tilcdc_drv.h"
13 
14 static const struct drm_plane_funcs tilcdc_plane_funcs = {
15 	.update_plane	= drm_atomic_helper_update_plane,
16 	.disable_plane	= drm_atomic_helper_disable_plane,
17 	.destroy	= drm_plane_cleanup,
18 	.reset		= drm_atomic_helper_plane_reset,
19 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
20 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
21 };
22 
23 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
24 				     struct drm_atomic_state *state)
25 {
26 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
27 									   plane);
28 	struct drm_crtc_state *crtc_state;
29 	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
30 									   plane);
31 	unsigned int pitch;
32 
33 	if (!new_state->crtc)
34 		return 0;
35 
36 	if (WARN_ON(!new_state->fb))
37 		return -EINVAL;
38 
39 	if (new_state->crtc_x || new_state->crtc_y) {
40 		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
41 			__func__);
42 		return -EINVAL;
43 	}
44 
45 	crtc_state = drm_atomic_get_existing_crtc_state(state,
46 							new_state->crtc);
47 	/* we should have a crtc state if the plane is attached to a crtc */
48 	if (WARN_ON(!crtc_state))
49 		return 0;
50 
51 	if (crtc_state->mode.hdisplay != new_state->crtc_w ||
52 	    crtc_state->mode.vdisplay != new_state->crtc_h) {
53 		dev_err(plane->dev->dev,
54 			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
55 			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
56 			new_state->crtc_w, new_state->crtc_h);
57 		return -EINVAL;
58 	}
59 
60 	pitch = crtc_state->mode.hdisplay *
61 		new_state->fb->format->cpp[0];
62 	if (new_state->fb->pitches[0] != pitch) {
63 		dev_err(plane->dev->dev,
64 			"Invalid pitch: fb and crtc widths must be the same");
65 		return -EINVAL;
66 	}
67 
68 	if (old_state->fb && new_state->fb->format != old_state->fb->format) {
69 		dev_dbg(plane->dev->dev,
70 			"%s(): pixel format change requires mode_change\n",
71 			__func__);
72 		crtc_state->mode_changed = true;
73 	}
74 
75 	return 0;
76 }
77 
78 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
79 				       struct drm_atomic_state *state)
80 {
81 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
82 									   plane);
83 
84 	if (!new_state->crtc)
85 		return;
86 
87 	if (WARN_ON(!new_state->fb || !new_state->crtc->state))
88 		return;
89 
90 	if (tilcdc_crtc_update_fb(new_state->crtc,
91 				  new_state->fb,
92 				  new_state->crtc->state->event) == 0) {
93 		new_state->crtc->state->event = NULL;
94 	}
95 }
96 
97 static const struct drm_plane_helper_funcs plane_helper_funcs = {
98 	.atomic_check = tilcdc_plane_atomic_check,
99 	.atomic_update = tilcdc_plane_atomic_update,
100 };
101 
102 int tilcdc_plane_init(struct drm_device *dev,
103 		      struct drm_plane *plane)
104 {
105 	struct tilcdc_drm_private *priv = dev->dev_private;
106 	int ret;
107 
108 	ret = drm_plane_init(dev, plane, 1,
109 			     &tilcdc_plane_funcs,
110 			     priv->pixelformats,
111 			     priv->num_pixelformats,
112 			     true);
113 	if (ret) {
114 		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
115 		return ret;
116 	}
117 
118 	drm_plane_helper_add(plane, &plane_helper_funcs);
119 
120 	return 0;
121 }
122